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Träfflista för sökning "WFRF:(Feltzing S.) srt2:(2000-2004)"

Sökning: WFRF:(Feltzing S.) > (2000-2004)

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1.
  • Castro-Tirado, A. J., et al. (författare)
  • GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB
  • 2003
  • Ingår i: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 411:1, s. 315-319
  • Tidskriftsartikel (refereegranskat)abstract
    • We present multiwavelength observations of a gamma-ray burst detected byINTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7days after the event. Here we report the discovery of a dim opticalafterglow (OA) that would not have been detected by many previoussearches due to its faintess (R ~ 23). This OA was seen to declinefollowing a power law decay with index alpha R = -0.95 +/-0.16. The spectral index beta_ opt/NIR yielded -1.25 +/- 0.14. Thesevalues may be explained by a relativistic expansion of a fireball (withp = 2.0) in the cooling regime. We also find evidence for inverseCompton scattering in X-rays.Based on observations with INTEGRAL, an ESA project with instruments andscience data centre funded by ESA member states (especially the PIcountries: Denmark, France, Germany, Italy, Switzerland, Spain), CzechRepublic and Poland, and with the participation of Russia and the USA.Also partially based on observations collected by the Gamma-Ray BurstCollaboration at ESO (GRACE) at the European Southern Observatory, Chile(ESO Large Programme 165.H-0464).
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2.
  • Feltzing, Sofia, et al. (författare)
  • Old Moving Groups - the Case of HR 1614
  • 2001
  • Ingår i: Dynamics of Star Clusters and the Milky Way, ASP Conference Series.. - 1583810609 ; 228, s. 335-335
  • Konferensbidrag (refereegranskat)
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3.
  • Feltzing, Sofia, et al. (författare)
  • Stellar Abundances in Giant Stars in the Metal-Rich Globular Cluster NGC 6528
  • 2003
  • Ingår i: New Horizons in Globular Cluster Astronomy (ASP Conference Proceedings ; 296). - 1583811435 ; 296, s. 377-378
  • Konferensbidrag (refereegranskat)abstract
    • We present the first results of a detailed abundance analysis, based on VLT observations, of giant stars in the very metal-rich globular cluster NGC 6528. We will be able to tie the horizontal branch abundances (see e.g. Carretta et al. 2001) to those of the more luminous giants (see CMDs). For the very similar cluster NGC 6553 studies of different types of stars have yielded very disparate results. Our first analysis of three of our stars seem to indicate that indeed the different sorts of stars do show similar abundances if one homogeneous set of models and parameters are being used.
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4.
  • Feltzing, Sofia, et al. (författare)
  • Thin and Thick Disk Results for α-, r- and s-Process Elements
  • 2004
  • Ingår i: Carnegie Observatories Astrophysics Series, Vol. 4: Origin and Evolution of the Elements. ; 4
  • Konferensbidrag (refereegranskat)abstract
    • We present the first results from several ongoing studies of the stellara bundances, ages, and chemical trends in the long-lived dwarf stars in the solar neighborhood that belong to the thin and thick galactic disk.We confirm that the trends of α-elements in the thin and thick disk are distinct, and we also find that the thick disk show the typical signature of SN Ia contribution to the chemical enrichment of the interstellar gas out of which the later generations of thick disk stars formed. From a first study of the r- and s-process elements we reportpreliminary evidence that AGB stars also have contributed to the chemical enrichment in the thick disk. Furthermore, we investigate the individual as well as the collective ages of the thick disk stars andfind evidence of an overall age-metallicity relation in the thick disk.This has, to our best knowledge, not been shown before. All this indicate that the star formation in what is today's thick disk was extended over time and, at least for the stars that are today close tothe sun, the gas which the stars formed out of was well-mixed. These findings seem to rule out scenarios where the thick disk formed in a fast dissipative collapse.
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5.
  • Thoren, P, et al. (författare)
  • Chemical abundances in cool metal rich disk dwarf stars
  • 2000
  • Ingår i: ASTRONOMY AND ASTROPHYSICS. - : SPRINGER-VERLAG. - 0004-6361. ; 363:2, s. 692-704
  • Tidskriftsartikel (refereegranskat)abstract
    • The present study of spectra of twelve metal-rich cool dwarf stars, carefully selected in order to cover a range of temperatures (similar to 4400 - 6000 K), is a follow UP On Feltzing & Gustafsson (1998) with the aim to understand the apparent over-ioniza
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